package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {
//    @Value("${baseUrl}")
    @Value("${baseUrl}")
    private String baseUrl;
    @PostMapping("/upload")
    public R<String> upload(@RequestParam("file") MultipartFile myFile) throws IOException {
//        System.out.println(myFile.getName());
//        System.out.println(myFile.getSize());
//        System.out.println(myFile.getOriginalFilename());

        String originalFilename = myFile.getOriginalFilename();
        String suffix = myFile.getOriginalFilename().substring(myFile.getOriginalFilename().lastIndexOf("."));

        String fileName = UUID.randomUUID().toString() + suffix;

        File dir = new File(baseUrl);
        if (!dir.exists()) dir.mkdir();

        try {
            myFile.transferTo(new File(dir+"/"+fileName));
        }catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(baseUrl + name));
            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
